The Trane RLY1678 Current Sensing Relay is an OEM electrical control used in compatible Trane HVAC equipment to monitor current flow and provide a switching signal when the monitored load reaches the relay’s operating threshold. The RLY1678 is identified as a 2/135A current sensing relay, with a sensing range extending up to 135 amps. This HVAC current sensing relay can be used in control applications where the system needs to detect current draw from motors, compressors, fans, or other electrical loads. The relay monitors current through the conductor and provides the appropriate control response. When replacing a current sensing relay, do not select a replacement based on amperage rating alone. Verify the Trane equipment model and serial number, original relay number, sensing range, conductor arrangement, control requirements, mounting configuration, and associated wiring before installation. Key Benefits Manufacturer: Trane Part Number: RLY1678 Product Type: Current Sensing Relay Current Rating: 2/135A Sensing Range: Up to 135A Configuration: Solid-Core Current Sensor Direct Replacement: RLY01678 Cross Reference: X13310270-01 Designed for compatible Trane HVAC control applications Common Questions What does the Trane RLY1678 do? The RLY1678 is a current sensing relay that monitors electrical current through a conductor and provides a relay response for compatible HVAC control circuits. What is the current rating of RLY1678? The Trane RLY1678 is identified as a 2/135A current sensing relay. What replaces Trane RLY1678? The Trane RLY01678 is identified as the current replacement for RLY1678. Does RLY1678 cross-reference to X13310270-01? Yes. X13310270-01 is associated with the RLY1678 replacement application. Can I substitute another 135A current sensing relay? Do not substitute based only on maximum amperage. Verify the sensing range, control requirements, mounting style, conductor configuration, wiring, and exact Trane equipment compatibility before installation. How do I verify compatibility? Confirm the RLY1678 / RLY01678 part number against the complete Trane equipment model and serial number or applicable factory parts breakdown before ordering. Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing. RLY1678 is the cross for X1331027001